In the foreseeable future, each developed country will create its own crypto currency, provided by the national currency.
How much can this contradict the very idea of Bitcoin as a free, decentralized system?
Need cryptocurrency state control?
I think it is not they are controlling bitcoin, but they are regulating bitcoin usage.
When a country wants to legalize bitcoin usage among their peoples, the government will need to regulate btc,
so there won't be any peoples using btc for bad purpose like scamming, or steal other's in their country.